Apple - Cmd+Tab does not work on hidden or minimized windows

This one is a bit tricky :

• press ⌘ Cmd + ⇥ Tab to show your running apps. Keep holding ⌘ Cmd.

• press ⇥ Tab until you've selected the app

• press the ⌥ Option, and let go of the ⌘ Cmd.
  ( You must release ⌘ Cmd after pressing ⌥ Option ! )

Use ⌘ Cmd-Tab to cycle to the desired application and then, while still holding down ⌘ Cmd, press the ↑ or ↓ arrow. This will show the application's windows in Expose. Select the desired window with the arrow keys and press Return to activate it.

http://www.macworld.com/article/1152366/commandtabminimizedwindows.html

Try this:

On your Mac,

1. Navigate to System Preferences
2. Go to Mission Control
3. Uncheck "When switching to an application, switch to a Space with open windows for the application"

Try using the cmd+tab now.